This bug was fixed in the package apt - 1.7.0~rc2ubuntu1
---------------
apt (1.7.0~rc2ubuntu1) cosmic; urgency=medium
* Fix calculation of elapsed usec in downloads
* pkgCacheFile: Only unlock in destructor if locked before (LP: #1794053)
-- Julian Andres Klode <juli...@ubuntu.com> Mon, 24 Sep 2018 12:18:26
+0200
** Changed in: apt (Ubuntu Cosmic)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1794053
Title:
pkgCacheFile unlocks in destructor even if it did not acquire lock
Status in apt package in Ubuntu:
Fix Released
Status in apt source package in Trusty:
Triaged
Status in apt source package in Xenial:
Triaged
Status in apt source package in Bionic:
Triaged
Status in apt source package in Cosmic:
Fix Released
Bug description:
[Impact]
Closing a cache file unlocks the system (loses the lock). This randomly
breaks ubuntu-make, for example.
[Test case]
The following Python code fails, but should succeed, as it locks first, opens
a cache and closes it, and then unlocks.
import apt_pkg, os, gc
apt_pkg.init()
apt_pkg.pkgsystem_lock()
os.system("ls -l /proc/%d/fd" % os.getpid())
apt_pkg.Cache()
gc.collect()
os.system("ls -l /proc/%d/fd" % os.getpid())
apt_pkg.pkgsystem_unlock()
[Regression potential]
This fixes a regression introduced in 2001 by
commit b2e465d6d32d2dc884f58b94acb7e35f671a87fe
Author: Arch Librarian <a...@canonical.com>
Date: Mon Sep 20 16:56:32 2004 +0000
Join with aliencode
Author: jgg
Date: 2001-02-20 07:03:16 GMT
Join with aliencode
The fix is to only UnLock from the cache file if the cache file locked
before. It's unclear how far code relies on that regression. That
said, any potential regression should be easily noticable, as it would
be a case of not unlocking where we were unlocking before.
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